Alterations of the free amino acid content in the hemolymph of Biomphalaria glabrata (Pulmonata) in starvation and after infection with Schistosoma mansoni (Trematoda).

1. Analysing the free amino acid content of the hemolymph of normally fed, starved and schistosome-infected Biomphalaria glabrata we identified 22 amino acids and amines, respectively. 2. In comparison with normally fed snails the free amino acid content of starved and infected snails was significantly reduced. 3. However, only slight differences between the ornithine and citrulline content occurred in the three test groups.